Bard PH13242-A Installation Instructions Manual - Start Up And Operation
Manual 2100-468J
Page
19 of 29
start uP anD OPeratIOn
three Phase scrOll cOmPressOr
start uP InFOrmatIOn
(models Ph13363-b, Ph13422-b, -c;
Ph13482-b, -c; Ph13602-b, -c)
All units with three phase scroll compressors are equipped
with a three phase line monitor to prevent compressor
damage due to phase reversal.
The phase monitor in this unit is equipped with two
LED’s. If the “Y” signal is present at the phase monitor
and phases are correct, the green LED will light.
If phases are reversed, the red fault LED will be lit and
compressor operation is inhibited.
If a fault condition occurs, reverse tow of the supply leads
to the unit. Do not reverse any of the unit factory wires as
damage may occur.
sequence OF OPeratIOn
blOwer Only
– When the “Fan” switch on the room
thermostat is placed in the “On” position (circuit R-G
makes), the blower will energize and run until the “Fan”
switch is placed back into the “Auto” position. This will
allow for constant air circulation at a lower airflow during
times when the unit is not in operation for cooling or
heating.
cOOlInG
– On a call for cooling from the room
thermostat (circuit R-Y makes), the blower will energize
(circuit R-G is automatic when R-Y makes) as well as the
compressor, and outdoor fan motor. Note that if the “Fan”
switch on the room thermostat is in the “On” position and
the blower is already in operation, then the motor will
ramp up to the required speed for cooling.
heatInG (1st stage)
– On a call for heating from
the room thermostat (circuit R-Y&B makes), the blower
will energize (circuit R-G is automatic when R-Y makes)
as well as the compressor, outdoor fan motor, and
reversing valve solenoid coil. This will place the system
into heat pump operation to maintain the thermostat set
temperature. Note that if the “Fan” switch on the room
thermostat is in the “On” position and the blower is
already in operation, then the motor will ramp up to the
required speed for heating.
heatInG (1st stage Defrost)
– During the defrost
cycle, the heat pump control will energize electric
heaters, if installed, (circuit R-W2 makes), allowing room
temperature to be maintained during heat pump defrost
operation.
heatInG (2nd stage)
– If the operation of the heat
pump will not maintain the set room temperature, then
the thermostat will call for additional heat from electric
heaters to help maintain the set temperature. On a call for
second stage heating from the room thermostat (circuit
R-W2 makes), backup electric heaters will be energized if
installed.
heatInG (em heat)
– When the room thermostat is
placed in the “Em Heat” position (circuit R-E makes), the
blower and electric heaters, if installed, will energize on
second stage heat (circuit R-W2&W3 makes), with the
compressor and outdoor fan motor locked out of operation.